This character can be easily controlled under water, using the same keys.

INVISIBLE MODE

Press ‘Space’ to enable STEALTH MODE. In addition to the stealth, your character gains a bonus speed in this mode. Now you can sneak up on enemies and attack them suddenly. You must enable the STEALTH MODE before the enemy may see you. Once you attack - you found. Press ‘Space’ again to disable the Stealth Mode. Note that the STEALTH MODE requires more energy consumption.